CN113833764A

CN113833764A - Hydrostatic bearing

Info

Publication number: CN113833764A
Application number: CN202111197727.XA
Authority: CN
Inventors: 陈万群; 滕翔宇; 霍德鸿; 陈高强; 丁辉
Original assignee: Jiangsu Jijingkai High End Equipment Technology Co ltd
Current assignee: Jiangsu Jijingkai High End Equipment Technology Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2021-12-24
Anticipated expiration: 2041-10-14
Also published as: CN113833764B

Abstract

The invention discloses a hydrostatic bearing which comprises a main shaft, a shaft sleeve, a bearing outer shell and two sealing end covers, wherein a plurality of oil cavities are uniformly distributed on the inner wall of the shaft sleeve, the main shaft penetrates through the middle part of the shaft sleeve, the bearing outer shell is sleeved outside the shaft sleeve, a working cavity is formed between the bearing outer shell and the shaft sleeve, a driving disc is arranged inside the working cavity, a plurality of driving blocks are slidably arranged on one side of the driving disc, and an adjusting plate is arranged at one end of each driving block, which penetrates through a preformed hole in the shaft sleeve. The invention adjusts the pressure of the compressed air injected into the air holes. The reciprocating motion along the horizontal direction can be controlled to the drive plate to drive all drive blocks to contract inwards or expand outwards along the vertical direction of the main shaft synchronously, so that the adjusting plate is driven to reciprocate, the gap between the oil cavity and the main shaft is changed, the thickness of an oil film is adjusted, the oil film machining requirements of different products are met, the machining precision is improved, and the service life is prolonged.

Description

Hydrostatic bearing

Technical Field

The invention relates to the technical field of hydrostatic bearings, in particular to a hydrostatic bearing.

Background

The hydrostatic bearing is a sliding bearing which is supplied with pressure oil by the outside and establishes a hydrostatic bearing oil film in the bearing to realize liquid lubrication, has the characteristics of high rotation precision, higher rigidity, stable rotation, no vibration and the like, and is widely applied to ultra-precision machine tools. The change of the rotating speed of the hydrostatic bearing during working can affect the thickness of an oil film and the pressure of the oil film, wherein a gap between a main shaft and an oil cavity is important for the forming condition of the hydrodynamic oil film. In the actual production, due to the difference of the types of workpieces and processing requirements, the bearing is required to be capable of changing within a large rotating speed range, and the rotation precision and stability of the main shaft are required to be ensured, however, gaps between the main shaft and an oil cavity of the conventional hydrostatic bearing are fixed when the hydrostatic bearing leaves a factory, the hydrostatic bearing can only work within a small rotating speed range, the formation condition of an oil film can be changed due to the change of the rotating speed of the main shaft, the bearing cannot work normally, and the hydrostatic bearing is difficult to adapt to different working conditions.

Therefore, how to provide a hydrostatic bearing capable of adjusting the gap between the oil cavity and the main shaft to meet different processing requirements is one of the technical problems to be solved urgently in the field.

Disclosure of Invention

Accordingly, the present invention is directed to a hydrostatic bearing, which solves the above-mentioned problems.

In order to solve the technical problems, the invention adopts the following technical scheme:

a hydrostatic bearing, comprising: the main shaft, the shaft sleeve, the bearing outer shell and the two sealing end covers are arranged on the main shaft; a plurality of oil cavities are uniformly distributed on the inner wall of the shaft sleeve; the main shaft penetrates through the middle part of the shaft sleeve; the bearing outer shell is sleeved outside the shaft sleeve and is fixedly connected with the shaft sleeve through the sealing end cover; a working cavity is formed between the bearing outer shell and the shaft sleeve; a driving disc is arranged in the working cavity; a plurality of driving blocks are arranged on one side of the driving disc in a sliding manner, and the driving blocks are obliquely arranged along the driving disc; one end of each driving block, which penetrates through the preformed hole in the shaft sleeve, is provided with an adjusting plate; the adjusting plates are matched with the oil cavities and are arranged in a one-to-one correspondence mode.

The beneficial effect of this technical scheme is: all the driving blocks are pushed by the driving disc to synchronously move in the direction perpendicular to the main shaft, so that the adjusting plate is driven to move, the gap between the oil cavity and the main shaft is changed, the thickness of an oil film is adjusted, the oil film thickness adjusting device is suitable for the processing requirements of different products, the processing precision is improved, and the service life is prolonged.

Preferably, the bearing outer shell is provided with an air hole; the air hole is positioned on one side of the driving disc far away from the driving block.

The beneficial effect of this technical scheme is: compressed air is injected through the air holes, the driving disc can be automatically pushed to move, and the operation is convenient and fast.

Preferably, sealing gaskets are arranged between the sealing end covers and the contact surfaces of the bearing outer shell and the shaft sleeve, and between the driving disc and the contact surfaces of the bearing outer shell and the shaft sleeve.

Preferably, each driving block and each adjusting plate are provided with oil inlet holes communicated with the oil chamber.

Preferably, the outer wall of the shaft sleeve is provided with a plurality of limiting blocks; correspondingly, the driving block is provided with a convex part corresponding to the limiting block; the protruding parts and the limiting blocks are arranged in a one-to-one correspondence mode.

The beneficial effect of this technical scheme is: the distance that the drive block inwards moved is limited, and the influence on product processing caused by the direct contact of the adjusting plate and the main shaft is avoided.

Preferably, a baffle is further arranged on one side of the driving block away from the driving disc.

The beneficial effect of this technical scheme is: the moving stability of the driving block is improved.

Preferably, the driving disc is provided with a plurality of sliding grooves in an inclined manner; correspondingly, each driving block is provided with an inclined surface matched with the sliding groove; the sliding grooves are in one-to-one correspondence with the driving blocks.

Preferably, a plurality of oil return grooves are uniformly distributed on the inner wall of the shaft sleeve.

Compared with the prior art, the invention has the following technical effects: the invention adjusts the pressure of the compressed air injected into the air holes. Can control the driving disk along horizontal direction reciprocating motion to drive all drive blocks synchronous along with main shaft vertical direction internal contraction or outside expansion, thereby drive regulating plate reciprocating motion, and then change the clearance between oil pocket and the main shaft, realize the adjustment of oil film thickness, with the processing demand of this adaptation different products, improve the machining precision, increase of service life, whole device simple structure, the simple operation.

Drawings

FIG. 1 is an isometric view of a hydrostatic bearing of the present invention;

FIG. 2 is a cross-sectional view of a hydrostatic bearing of the present invention;

FIG. 3 is a schematic structural view of a drive plate;

FIG. 4 is a schematic structural view of a driving block and a regulating plate;

FIG. 5 is a schematic structural view of the bushing;

in the figure: 1. a main shaft; 2. a shaft sleeve; 3. a bearing outer housing; 4. sealing the end cap; 5. an oil chamber; 6. a working chamber; 7. a drive disc; 8. a drive block; 9. an adjusting plate; 10. air holes; 11. a sealing gasket; 12. an oil inlet hole; 13. a limiting block; 14. a baffle plate; 15. an oil return groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1, the present invention discloses a hydrostatic bearing, including: the device comprises a main shaft 1, a shaft sleeve 2, a bearing outer shell 3 and two sealing end covers 4; 4 oil cavities 5 are uniformly distributed on the inner wall of the shaft sleeve 2; the main shaft 1 is arranged in the middle of the shaft sleeve 2 in a penetrating way; the bearing outer shell 3 is sleeved outside the shaft sleeve 2 and is fixedly connected with the shaft sleeve 2 through a sealing end cover 4; a working cavity 6 is formed between the bearing outer shell 3 and the shaft sleeve 2; a driving disc 7 is arranged in the working cavity 6; one side of the driving disc 7 is slidably provided with 4 driving blocks 8, and the 4 driving blocks 8 are obliquely arranged along the driving disc 7; one end of each driving block 8 penetrating through a preformed hole on the shaft sleeve 2 is provided with an adjusting plate 9; the adjusting plates 9 are matched with the oil chambers 5 and are arranged in a one-to-one correspondence manner.

An air hole 10 is arranged on the bearing outer shell 3; the air hole 10 is located on the side of the drive plate 7 remote from the drive block 8.

In the present embodiment, sealing gaskets 11 are respectively arranged between the sealing end cover 4 and the contact surfaces of the bearing outer shell 3 and the shaft sleeve 2, and between the driving disk 7 and the contact surfaces of the bearing outer shell 3 and the shaft sleeve 2.

In the present embodiment, each of the drive block 8 and the adjusting plate 9 is provided with an oil inlet hole 12 communicating with the oil chamber 5.

In this embodiment, the outer wall of the shaft sleeve 2 is provided with a plurality of limiting blocks 13; correspondingly, the driving block 8 is provided with a convex part corresponding to the limiting block 13; the protruding portions and the limiting blocks 13 are arranged in a one-to-one correspondence.

In this embodiment, the side of the driving block 8 remote from the driving disc 7 is also provided with a baffle 14.

In the present embodiment, the driving disk 7 is provided with 4 sliding grooves in an inclined manner; correspondingly, each driving block 8 is provided with an inclined surface matched with the sliding groove; the chutes and the driving blocks 8 are arranged in one-to-one correspondence.

In this embodiment, 4 oil return grooves 15 are further uniformly distributed on the inner wall of the shaft sleeve 2.

In other embodiments, the number of the oil chambers 5, the driving block 8, the sliding grooves and the oil return grooves 15 can be designed according to actual requirements.

The working principle is as follows: (1) lubricating oil is injected into the oil cavity 5 through the oil inlet hole, compressed air is injected through the air hole 10, the main shaft 1 is rotated, and an oil film is formed by the lubricating oil between the main shaft 1 and the oil cavity 5 on the inner wall of the shaft sleeve 2 under the condition of relative motion; (2) when the pressure of compressed air is increased, the driving disc 7 is pushed to move forwards, so that the driving block 8 is driven to contract inwards, the adjusting plate 9 is further pushed to contract inwards, the gap between the main shaft 1 and the oil cavity 5 is reduced, and the thickness of an oil film is reduced correspondingly; (3) when the pressure of the compressed air is reduced, the force applied by the driving disk 7 to the driving block 8 is reduced, and the driving block 8 moves outwards under the driving of the oil film pressure, so that the gap between the main shaft 1 and the oil cavity 5 is enlarged, and the oil film thickness is increased.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims

1. A hydrostatic bearing, comprising: the device comprises a main shaft (1), a shaft sleeve (2), a bearing outer shell (3) and two sealing end covers (4); a plurality of oil cavities (5) are uniformly distributed on the inner wall of the shaft sleeve (2); the main shaft (1) penetrates through the middle part of the shaft sleeve (2); the bearing outer shell (3) is sleeved on the outer side of the shaft sleeve (2) and is fixedly connected with the shaft sleeve (2) through the sealing end cover (4); a working cavity (6) is formed between the bearing outer shell (3) and the shaft sleeve (2); a driving disc (7) is arranged in the working cavity (6); a plurality of driving blocks (8) are slidably arranged on one side of the driving disc (7), and the driving blocks (8) are obliquely arranged along the driving disc (7); one end of each driving block (8) penetrating through a preformed hole in the shaft sleeve (2) is provided with an adjusting plate (9); the adjusting plates (9) are matched with the oil cavities (5) and are arranged in a one-to-one correspondence mode.

2. Hydrostatic bearing according to claim 1, characterized in that the bearing outer housing (3) is provided with air holes (10); the air hole (10) is positioned on one side of the driving disc (7) far away from the driving block (8).

3. Hydrostatic bearing according to claim 1, characterized in that sealing gaskets (11) are provided between the sealing end caps (4) and the contact surfaces of the bearing outer housing (3) and the shaft sleeve (2), and between the driving discs (7) and the contact surfaces of the bearing outer housing (3) and the shaft sleeve (2).

4. Hydrostatic bearing according to claim 1, characterized in that each driving block (8) and each regulating plate (9) is provided with an oil inlet (12) communicating with said oil chamber (5).

5. Hydrostatic bearing according to claim 1, characterized in that the outer wall of the sleeve (2) is provided with a plurality of stop blocks (13); correspondingly, the driving block (8) is provided with a convex part corresponding to the limiting block (13); the protruding parts and the limiting blocks (13) are arranged in a one-to-one correspondence mode.

6. Hydrostatic bearing according to claim 1, characterized in that the side of the drive block (8) remote from the drive disk (7) is further provided with a baffle (14).

7. Hydrostatic bearing according to claim 1, characterized in that said driving plate (7) is provided with a plurality of sliding grooves in an inclined manner; correspondingly, each driving block (8) is provided with an inclined surface matched with the sliding groove; the sliding grooves and the driving blocks (8) are arranged in a one-to-one correspondence mode.

8. Hydrostatic bearing according to claim 1, characterized in that the inner wall of the sleeve (2) is further provided with a plurality of oil return grooves (15).